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Old 01-21-2010, 09:06 PM   #1
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Ticking/tapping/knocking sound, please help!!

Edit:

Video Added, have a listen!

http://www.youtube.com/watch?v=5dadiOB3UU8



Hey guys,

Got a 2005 Colorado, 2.8 4 cyl. 5 speed manual with 83,000 miles.

Ok, the truck is making a pinging tapping knocking sound in the front top end of the motor. I have cleaned the TB, changed the oil and ac delco filter, new air filter, ran techron through it, checked the cam actuator valve and it has all the screens, checked compression all 173-181, new ac delco plugs and all old plugs were worn evenly, dry and no abnormal wear.

It only seems to make this noise at idle and a little above, once above 1000 rpm you can't hear it. It seems to run strong, please help!

Took it to Chevy to see if it was the Valve seat extended coverage but they charged me $100 then told me they don't know what is wrong with it but for another $800 they should be able to figure it out...uh how about you go F%$# yourself!

Sorry to rant, just a lil fed up with this truck. Also when you pull the oil fill neck while its running it has a lot of pressure and spits oil on the underside of the hood...but the compression seems fine.

Thanks in advance guys, sorry to be pissed.

Last edited by Makakoa; 01-21-2010 at 11:25 PM.
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Old 01-21-2010, 09:12 PM   #2
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Re: Ticking/tapping/knocking sound, please help!!

it sounds like the top end is not getting correct lubrication, and also pressure is building in the crank case, could be the wrong or clogged oil filter, compression rings on the pisttoniesss, try adding lucas to your oil. i will pull the specs on compression for you in the morning and post them, i have access to the oem man. information direct.
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Old 01-21-2010, 09:18 PM   #3
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Re: Ticking/tapping/knocking sound, please help!!

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it sounds like the top end is not getting correct lubrication, and also pressure is building in the crank case, could be the wrong or clogged oil filter, compression rings on the pisttoniesss, try adding lucas to your oil. i will pull the specs on compression for you in the morning and post them, i have access to the oem man. information direct.
Thanks man, I double checked the filter and it did it with the last oil filter as well. I have heard other people talk about some tabs that get misaligned or something not allowing oil to drain from the head and causing the pressure? Ever heard of that? Ever seen a cam phaser go bad on one of these?
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Old 01-21-2010, 09:18 PM   #4
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Re: Ticking/tapping/knocking sound, please help!!

I had this happen to one of my other vehicles. It was caused by my failure to notice that the damn thing was 3 quarts low on oil, which caused the valves to start tapping because they weren't getting enough/any oil.
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Old 01-21-2010, 09:18 PM   #5
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Re: Ticking/tapping/knocking sound, please help!!

Oh and no codes
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Old 01-21-2010, 09:21 PM   #6
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Re: Ticking/tapping/knocking sound, please help!!

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I had this happen to one of my other vehicles. It was caused by my failure to notice that the damn thing was 3 quarts low on oil, which caused the valves to start tapping because they weren't getting enough/any oil.
Thanks for the reply, but she has fresh syn in her and is right in the middle of the stick. I really with that was it though lol.
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Old 01-21-2010, 09:22 PM   #7
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Re: Ticking/tapping/knocking sound, please help!!

are you sure its not something to do with the fan, something in it, or maybe a pulley? do you have your blower on? leaf in it? exclude everrrryyything
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Old 01-21-2010, 09:26 PM   #8
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Re: Ticking/tapping/knocking sound, please help!!

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are you sure its not something to do with the fan, something in it, or maybe a pulley? do you have your blower on? leaf in it? exclude everrrryyything
No, I can hear it with my stethoscope in the head, seems like it is coming from the timing chain/cam phaser area. Follws engine rpm as well, I can only hear it until about 1000 rpm or below.
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Old 01-21-2010, 09:34 PM   #9
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Re: Ticking/tapping/knocking sound, please help!!

cam bearing?
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Old 01-21-2010, 09:35 PM   #10
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Re: Ticking/tapping/knocking sound, please help!!

worn keeper?
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Old 01-21-2010, 09:43 PM   #11
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Re: Ticking/tapping/knocking sound, please help!!

Maybe the timing chain tensioners are worn causing the chain to slap? I know the old quad 4's and ecotechs were famous for it

any chance you can get a video or audio file of it to at least get a rough idea?
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Old 01-21-2010, 09:43 PM   #12
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Re: Ticking/tapping/knocking sound, please help!!

not sure? I guess I will have my buddy pull it apart and hope it isn't another $1000.
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Old 01-21-2010, 09:44 PM   #13
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Re: Ticking/tapping/knocking sound, please help!!

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Maybe the timing chain tensioners are worn causing the chain to slap? I know the old quad 4's and ecotechs were famous for it

any chance you can get a video or audio file of it to at least get a rough idea?
Yeah, I have a clip from my Iphone but its some strange file format. I will try to get one with my camera tonight.
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Old 01-21-2010, 10:14 PM   #14
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Re: Ticking/tapping/knocking sound, please help!!

alright I'll check back tomorrow and see if you got it up, from what you told me now I'm leaning more towards the timing chain tensioners especially since it passed the leak down and compression with no issues that means it most like has nothing to do with the valves.

I just did a little research for you there was an upper timing chain guide which was not included at one point but can't find the year or anything other than the fact it was not on some years doesn't give anything more specific, but that was either added or removed for some reason so I would look into that first.
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Old 01-21-2010, 10:31 PM   #15
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Re: Ticking/tapping/knocking sound, please help!!

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Originally Posted by FixxxerKH202 View Post
alright I'll check back tomorrow and see if you got it up, from what you told me now I'm leaning more towards the timing chain tensioners especially since it passed the leak down and compression with no issues that means it most like has nothing to do with the valves.

I just did a little research for you there was an upper timing chain guide which was not included at one point but can't find the year or anything other than the fact it was not on some years doesn't give anything more specific, but that was either added or removed for some reason so I would look into that first.
Just a note, it didn't have a leakdown test, I just did a basic 6 crank compression check and got between 173-181 psi on the four cylinders. I tried to have the dealer do a leakdown but they said since it runs rougher cold than it does warm they think its not the valve seat issue...bs.


Thanks for all the replies, you guys are great!
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Old 01-21-2010, 11:23 PM   #16
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Re: Ticking/tapping/knocking sound, please help!!

Ok guys, I posted a video of it idleing right now. It sounds way worse on video than it actually is but you can hear it. It may take a minute to load on the site but it played for me. Take a listen, cringe a bit and then shoot me your thoughts.

YouTube - MOV03916.MPG
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Old 01-21-2010, 11:26 PM   #17
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Re: Ticking/tapping/knocking sound, please help!!

This may be too easy, but the injectors were loud as hell in my '05 I-5 Canyon.
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Old 01-22-2010, 10:15 AM   #18
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Re: Ticking/tapping/knocking sound, please help!!

Remove the air duct from the throttle control module.
Remove the ignition control modules.
Disable the fuel system.
Remove the spark plugs.
Measure the engine compression, using the following procedure:
Firmly install gauge to the spark plug hole.
Have an assistant crank the engine through at least four compression strokes in the testing cylinder.
Check and record the readings on J 38722 at each stroke.
Disconnect gauge
Repeat the compression test for each cylinder.

Record the compression readings from all of the cylinders. A normal reading should be approximately 1482 kPa (215 psi) . The lowest reading should not be less than 70 percent of the highest reading.
The following are examples of the possible measurements:

-When the compression measurement is normal, the compression builds up quickly and evenly to the specified compression on each cylinder.

-When the compression is low on the first stroke and tends to build up on the following strokes, but does not reach the normal compression, or if the compression improves considerably with the addition of three squirts of oil, the piston rings may be the cause.

-When the compression is low on the first stroke and does not build up in the following strokes, or the addition of oil does not affect the compression, the valves may be the cause.

-When the compression is low on two adjacent cylinders, or coolant is present in the crankcase, the head gasket may be the cause.

Install the air duct to the throttle body.
Install the spark plugs.
Enable the fuel system.
Install the ignition control modules.
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Old 01-24-2010, 12:10 AM   #19
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Re: Ticking/tapping/knocking sound, please help!!

Update:

So I pulled the intake manifold (What a PITA) and valve cover today to try and find my ticking/knocking sound. I could hear it with my stethoscope in the head and it follows cam timing not crank timing so I am thinking I have an issue somewhere in the valves.

Well...pull the valve cover and everything looks fine, all the rocker arms are in place, all the cam lobes are clean with no scarring (One had a tiny scratch in it from what looked like a piece of debris) all the rollers on the rocker arms roll when the cam is turned, all the keepers seem to be in place, am I missing something?

One thing I did notice is when I would manually turn the crank once every 1-2 rotations the timing chain would dip between the two sprockets and slap back up at top guide. Not sure if it was doing this because I was manually turning the crank or if this is my noise? If that made sense lol.
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Old 01-24-2010, 12:23 AM   #20
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Re: Ticking/tapping/knocking sound, please help!!

I wonder if your timing chain tensioner is shot
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